<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
  .wrap{
    display: flex;
    justify-content: flex-start
}
.item{
    margin-left: auto;
}
    </style>
  </head>
  <body>
<div class="wrap">
    <span>1</span>
    <span>2</span>
    <span class="item">3</span>
</div>

  </body>
</html>

